AJDI participation rate reaches 44%
As of May 23, 2012, 258 of Alberta's 585 dairy herds had completed a Johne's disease risk assessment and formulated a risk-reduction management plan. Analysis of manure samples taken from 6 diferent sites in various locations around these farms revealed that 75% had no samples testing positive for MAP (Mycobacterium avium subspecies paratuberculosis), the pathogen causing Johne's disease. The distribution of these 'environmental' test results is summarized in the table on the right.
|Positive Samples||% of Farms|
Among the management practices identified in participant risk assessments:
- 59% of producers placed no restrictions on visitor access to animals;
- 76% of producers purchased animals within the past 5 years with no consideration of the MAP infection status of the seller farm;
- 70% of producers housed more than one cow in a calving pen more than 50% of the time.
Management changes most frequently suggested in participant management plans included:
- 20% of management plans proposed more rapid removal of the calf from her dam;
- 14% suggested replacingf raw milk with milk replacer or pasteurized milk for feeding to calves;
- 11% suggested only buying cattle from herds with known Johne's disease status;
- 11% recommended using separate equipment for manure handling and feeding;
- 9% recommended using a dedicated calving pen rather than allowing cows to calf in various other areas of barns or outside pens.